A 2-year-old boy presents with fever (38.5°C), hoarse voice, and barking cough worse at night with inspiratory stridor. Vital signs show HR 115/min, RR 28/min, SpO2 98% on room air. Neck X-ray reveals characteristic subglottic narrowing with the "steeple sign." He denies dysphagia and has no drooling. He takes no regular medications. Which pathogen most likely causes this condition?
- A)Streptococcus pneumoniae
- B)Parainfluenza virusGABARITO
- C)Haemophilus influenzae type b
- D)Coronavirus
- E)Respiratory syncytial virus
Explicação
Parainfluenza virus is correct. Croup, or laryngotracheobronchitis, classically presents with barking cough, hoarseness, and inspiratory stridor due to subglottic inflammation. The steeple sign on neck imaging is a classic finding. Ver explicação completa e trilha adaptativa →